You can't use illustrations made by someone else in your entry. You should read the rules: Photoshop rule 5.7. 3D Renders or Illustrations as Source: Using other people's 3D renders or illustrations (even with permission and no matter in which form they are offered) creates a false impression of your artwork. So 3D renders or illustrations (this includes brushes, tubes, clipart, pdf files) can not be used as sources, unless they are entirely created by yourself.

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author says:

where is illustrations here ???
i used one photo and i got it from resources tab . free stock site